Cooler in diesel line. Why? -

LinkBack Thread Tools
post #1 of 3 Old 02-05-2012, 07:05 AM Thread Starter
CRD Pilot!
alfaitalia's Avatar
2004 WJ 
Join Date: Feb 2011
Location: Bognor
Posts: 5,853
Cooler in diesel line. Why?

I ran over a brick yesterday and whilst I was checking underneath (no damage luckily) I noticed a smal cooler (like an oil cooler) in the diesel return line, near the tank - factory fit. Never noticed it before. Why is it there. Does the diesel get that hot in the fuel rail that it has to be cooled before going bask into the tank??

Just curious.

If you can't fix it with a hammer, you've got yourself an electrical problem!
alfaitalia is offline  
Sponsored Links
post #2 of 3 Old 02-05-2012, 07:43 AM
Registered User
2004 WJ 
Join Date: Sep 2011
Location: Tiverton
Posts: 1,575
Fuel in deisel systems is constantly circulating and gets warm from the heat of the engine, the cooler counteracts this.
Think like this, fuel expands when it warms up and contracts when it cools, the cooler the fuel/air the more power your engine makes.
Rocklobster is offline  
post #3 of 3 Old 02-05-2012, 08:25 AM
Registered User
Join Date: Oct 2011
Location: Glasgow
Posts: 2,443
I noticed the same thing on mine. I also noted that it was well....very exposed to the elements and didn't think it would take much to damage it... I don't think its that clever a design.
MadderThanMax is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Trans Cooler Line Help Please delkin WJ Grand Cherokee Forum 3 01-22-2012 08:46 AM
p/s cooler question? JeepinWJ86 WJ Grand Cherokee Forum 0 02-11-2011 02:02 PM
Tranmission Cooler 99JeepGC47 WJ Grand Cherokee Forum 2 09-08-2010 06:12 PM
wj trans cooler TheBoss WJ Grand Cherokee Forum 14 07-16-2010 08:45 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome